Stainless Steel 420B is a martensitic stainless steel known for its durability and versatility in various applications. It is a type of stainless steel that falls within the 400 series, characterized by its high carbon content and moderate corrosion resistance. The chemical composition of Stainless Steel 420B typically includes around 0.26-0.40% carbon, 1.00% manganese, 1.00% silicon, 12.00-14.00% chromium, and small amounts of other alloying elements.
One of the standout features of Stainless Steel 420B is its exceptional hardness and wear resistance, making it ideal for applications requiring sharp edges and cutting tools like surgical instruments, kitchen knives, and scissors. Its martensitic structure lends itself well to heat treatment, allowing for a range of hardness levels to be achieved through processes like quenching and tempering. This flexibility makes it suitable for various mechanical components and industrial knives.
Machining Stainless Steel 420B can be challenging due to its high carbon content, which makes it prone to work hardening. However, with the right tools and techniques, it can be machined effectively. Preheating and annealing may be necessary to improve machinability.
In terms of heat resistance, Stainless Steel 420B is not designed for high-temperature applications, as it begins to lose its mechanical properties at elevated temperatures. It is best suited for environments with moderate heat levels.
Corrosion resistance is moderate in Stainless Steel 420B, and it is susceptible to rust and staining in certain environments. It is not recommended for use in highly corrosive or marine settings unless properly maintained and passivated. Regular cleaning and oiling can help mitigate corrosion risks.
|420B||0.26-0.35||1.00 max||1.50 max||0.040 max||0.030 max||12.00-14.00|
|Hardness||Mechanical||[HRC]||48 – 58||–||–|
|Ultimate tensile strength||Mechanical||[MPa]||1700 – 1900||[psix10^3]||250 – 275|